My main interests are in reproductive strategies: life history traits and sexual behaviour.

I study the role of frequency dependent selection (rare male advantage and predator search image) in maintaining the extreme, genetically-based variation in the colour patterns of male guppies. Other projects look at the role of sensory bias in mate choice decisions of female guppies, other poeciliids, goodeids and related species. I have also studied the ways in which individuals in adjust their reproductive strategies to the behaviour and population demography (e.g., sex ratio, density) of conspecifics.

My students, postdocs and I have investigated all of these questions in guppies and their relatives in the lab and in natural populations in Trinidad